Pontiac Vibe 2003 Owner's Manual page 294

Center High-Mounted Stoplamps (CHMSL)
To replace the center high
the following:
1. The bulb is located on the inside of the liftgate
liftglass near the top. Remove the two clips on both
sides of the cover and remove it.
2. Unscrew the two screws from the CHMSL housing
and remove the housing to expose the bulb.
6-48
-
mounted stoplamp bulb, do
3. Turn the bulb socket counterclockwise and pull it out
of the lamp housing.